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Revenue Recognition (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
Revenue Recognition        
Favorable cumulative catch-up adjustments $ 4.1 $ 4.2 $ 6.9 $ 6.1
Unfavorable cumulative catch-up adjustments (2.1) (1.7) (2.1) (1.7)
Cumulative catch-up adjustments, net $ 2.0 $ 2.5 $ 4.8 $ 4.4
Practical Expedient, Incremental costs of obtaining a contract     true  
Practical Expedient, Remaining performance obligations     true